Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/a6e35072f019
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #20552 from cctuan/1024933

Bug 1024933 - [Text Selection] Utility bubble's shadow improvement

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https://hg.mozilla.org/integration/gaia-central/rev/58ac9bbac4e2
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 1024933 - [Text Selection] Utility bubble's shadow improvement

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "c03d5053b170fc8e6de894825bf2b216c0729b89", 
+    "revision": "a6e35072f019c773e123d899a207bdf70abef19f", 
     "repo_path": "/integration/gaia-central"
 }